Scaffold construction



Jan. 15, 1952 P. M. KNUDSEN SCAFFOLD CONSTRUCTION Filed April' 2, 1949 firrow Patented Jan. 15, 1952 Peter Knudsen, Katonah, N. Y.

Application April 2, 1949, Serial No. 85,235

1 Claim. (Cl. 304--16) This invention relates to a scaifold construction.

It is an object of the present invention to provide a scaffold construction wherein adequate upright support is provided to prevent the user of the scaffold from falling and to prevent loss of supplies from the scaffold, and whereby to pro- Vide a complete rigid construction between the brackets and the longitudinally extending members.

It is another object of the present invention to provide a scaffold construction which is safe, wherein unitary brackets are utilized for the supporting of the planks and rails which extend between the brackets and wherein sufficient connection is made between the planks and rails and the brackets to prevent the brackets from slipping from the ends of the planks and so that control of the scaffold is maintained at all times.

It is another object of the present invention to provide brackets for scaffolds which can be formed of a continuous strip bent and folded to receive and retain the planks and the supporting rails and wherein the brackets at the ends of the scaffold are connected between the upper ends of the upright portions and have a twist for obtaining a strengthened portion to which a hanger is secured and wherein the end brackets form a complete integral ring.

Other objects of the present invention are to provide a scaffold construction whichis simple, inexpensive to manufacture, easy to assemble and disassemble, rigid, safe, has a minimum number of parts, adequately braced, convenient to use and eflicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. l is a perspective view of the scaffold construction embodying the features of the present invention, suspended along awall.

Fig. 2 is a vertical transverse sectionalview taken through the end bracket and on line 2--2 of Fig. 1.

Fig. 3 is a transverse sectional view taken on line 33 of Fig. 1.

Referring now to the figures, Ill and II represent respectively end brackets having the hangers I2 respectively adapted to connect the brackets and the scaffold to the pulley blocks I3 suspended from the top of a building having a wall I4.

Each of the brackets I0 and II are formed of a continuous strip of metal bent to provide a bottom portion I5, upright side portions I6 and I! and a top portion I8 twisted to receive the hangers 12, The ends of the strip are joined together at the top as indicated at'I 9 and welded at 20 whereby to provide an integral bracket.

The upper end of the upright portion I6 has a U-shaped bend 2| into which is fitted the outside rail plank-22 of substantial-width to give rigidity to the scaffold and to provide a safety rail. On this rail can be located a box 22' for supporting tools of a small nature so that they will be readily accessible and made handy to the user of the scaffold and without his having to bend over or assume an unsafe position. This plank 22 is made secure in the bent portions 2I by bolts 23 and. nuts 24. These bolts extend vertically between the top and bottom sides of the bend 2|. The top portion I8 is twisted at 25 and 26 to receive hook formations 21 of the hanger. These formations are welded to the sides of the top portion, as indicated at 28.

Planks 3| and 32 are secured to the bottom portions I5 of the brackets. A plank 33 standing on edge is sufficiently high to confine articles resting on the planks and to prevent loss of the same from the scaffold. The inner side of the bracket has a brace member 34 which will serve to prevent the loss of articles from the inner side of the scaffold. The planks are made secure to the bottom portion I5 by bolts 35. The guard 33 is made secure by bolts 36 to the upright portion I6 of the bracket while the inner guard member 34 is made secure by bolts 31.

To further make rigid the scaffold, a top inner guard rail 4| is secured'to the brackets by bolts 42. This rail 4| extends along the inner side of the scaffold.

It should be apparent that by the entire assembly made in this manner with an integral and continuous end bracket and rigid planks extended to give maximum rigidity from the direction most needed, that a sturdy and rigid construction is had. It should be apparent that the brackets are made secure with the planks and guard rail members so that there is little opportunity of the brackets slipping along the members as one end of the scaffold is lowered below the other.

For extra long scaffolds, it may be well to have an intermediate bracket as indicated at 44, Figs. 1 and 3. This bracket is formed of a channel piece and has a bottom portion 45, inner and outer upright portions 46 and 47. The upper end of the upright portion 41 has a double bend 48 to confine the upper and outer guide rail plank 22. This bracket 44 is without a top portion in order to allow the user of the scaffold to walk therealong between the end brackets. The several planks 3| and 32 and members 33, 34 and 4| are secured to this bracket 14 in the same manner that they are secured to the end brackets as by means of the securing bolts and nuts. This bracket 44 will support the planks 3| and 32 intermediate the ends thereof.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claim.

What is claimed is:

A scaffold construction comprising end brackets,

each of said end brackets formed of a flat continuous strip having its ends secured together and having a bottom portion, inner and outer up,- right portions and a horizontal top portion connecting the upper ends of the upright portions together, one of said upright portions havin a double bend therein at its connection with the top portion, longitudinally extending planks and 4 right to give rigidity thereto and hanger members respectively secured to the brackets and adapted for connection with pulley blocks, and an intermediate bracket formed of a channel strip having a bottom portion and inner and outer upright side portions, the upper end of the outer side portion having a double bend and adapted to receive the top outer side rail, said inner rail and the longitudinally extending planks and members, being supported within the intermediate bracket.

PETER M. KNUDSEN.

REFERENCES CITED The iollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name. Date 516,606 Mann Mar. 13, 1894. 1,190,709 Bertodo July 11, 1916 1,598,367 Diamond Aug. 31, 1926 2,007,294 Cischke July 9, 1935 2,024,904 Amesbury Dec. 1'7, 1935 2,294,240 Pullman Aug. 25, 1942 FOREIGN PATENTS Number Country Date 191,254 Great Britain Jan. 11, 1923 

